package com.dalianpai.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.dalianpai.common.to.SkuHasStockVo;
import com.dalianpai.common.to.mq.OrderTo;
import com.dalianpai.common.to.mq.StockDetailTo;
import com.dalianpai.common.to.mq.StockLockedTo;
import com.dalianpai.common.utils.R;
import com.dalianpai.common.utils.RRException;
import com.dalianpai.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.dalianpai.gulimall.ware.entity.WareOrderTaskEntity;
import com.dalianpai.gulimall.ware.feign.OrderFeignService;
import com.dalianpai.gulimall.ware.feign.ProductFeignService;
import com.dalianpai.gulimall.ware.service.WareOrderTaskDetailService;
import com.dalianpai.gulimall.ware.service.WareOrderTaskService;
import com.dalianpai.gulimall.ware.vo.CartItem;
import com.dalianpai.gulimall.ware.vo.LockStockResult;
import com.dalianpai.gulimall.ware.vo.OrderEntity;
import com.dalianpai.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import lombok.SneakyThrows;
import org.apache.commons.lang3.StringUtils;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.dalianpai.common.utils.PageUtils;
import com.dalianpai.common.utils.Query;

import com.dalianpai.gulimall.ware.dao.WareSkuDao;
import com.dalianpai.gulimall.ware.entity.WareSkuEntity;
import com.dalianpai.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;



@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired(required = false)
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    OrderFeignService orderFeignService;

    /**
     * 1.库存自动解锁：
     * 下单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。之前锁定的库存就要自动解锁。
     * @param
     * @return
     */
    @Override
    public void unLockStock(StockLockedTo to) {
        StockDetailTo detailTo = to.getDetailTo();
        Long detailToId = detailTo.getId();
        //解锁
        //1.查询数据库关于这个订单的锁定库存信息
        // 有:证明锁定成功了
        //    解锁订单情况
        //        1.没有这个订单，不必解锁库存
        //        2.有这个订单。
        ///           订单状态：已取消，解锁库存状态
        //                    没取消，不能解锁
        // 没有：库存锁定失败了，库存回滚了，这种情况无需解锁。
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailToId);
        if(byId !=null){
            //解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();
            R r = orderFeignService.getOrderStatus(orderSn);
            if(r.getCode() == 0){
                OrderEntity data = r.getData(new TypeReference<OrderEntity>() {
                });
                if(data ==null ||data.getStatus() == 4){
                    if(byId.getLockStatus() ==1){
                        unLockStock(detailTo.getSkuId(),detailTo.getWareId(),detailTo.getSkuNum(),detailToId);
                    }
                }
            }else{
                throw new RuntimeException("远程服务异常");
            }
        }
    }

    //防止订单服务卡顿，导致订单状态消息一直改不了，库存消息优先到期。查订单状态新建状态，什么都不做就走了。
    //导致卡顿的订单，永远不能解锁库存
    @Override
    public void unLockStock(OrderTo to) {
        String orderSn = to.getOrderSn();
        WareOrderTaskEntity task = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = task.getId();
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().eq("task_id", id)
                .eq("lock_status", 1));
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }

    }


    private void unLockStock(Long skuId, Long wareId, Integer skuNum, Long detailToId) {
      wareSkuDao.unLockStock(skuId,wareId,skuNum);
        WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity();
        entity.setId(detailToId);
        entity.setLockStatus(2);
        orderTaskDetailService.updateById(entity);

    }


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 1
         * wareId: 2
         */
        QueryWrapper<WareSkuEntity> queryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if(!StringUtils.isEmpty(skuId)){
            queryWrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if(!StringUtils.isEmpty(wareId)){
            queryWrapper.eq("ware_id",wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                queryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果还没有这个库存记录新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if(entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务无需回滚
            //1、自己catch异常
            //TODO 还可以用什么办法让异常出现以后不回滚？高级
            try {
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");

                if(info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuName"));
                }
            }catch (Exception e){

            }

            wareSkuDao.insert(skuEntity);
        }else{
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkusHasStock(List<Long> skuIds) {
        List<SkuHasStockVo> hasStockVoList = skuIds.stream().map(id -> {
            SkuHasStockVo vo = new SkuHasStockVo();
            Long count = baseMapper.getSkuStock(id);
            vo.setSkuId(id);
            vo.setHasStock(count ==null ?false:count > 0);
            return vo;
        }).collect(Collectors.toList());
        return hasStockVoList;
    }

    /**
     * 库存解锁的场景
     * 1）下单成功，订单过期没有支付被系统自动取消，被用户手动取消。都要解锁库存
     *
     * 2）下单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     *    之前锁定的库存就要自动解锁。
     *
     * @param vo
     * @return
     */
    @Transactional
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);
        //1. 找到每个商品在哪个仓库都有库存
        List<CartItem> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());

        //2. 锁定库存
        for(SkuWareHasStock hasStock:collect){
            Boolean skuStocked = false;
            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if(wareIds == null || wareIds.size() ==0){
                throw new RRException(skuId+"不存在");
            }
            for (Long wareId : wareIds){
                //成功就是1，失败就是0
                Long count = wareSkuDao.lockSkuStock(skuId, wareId, hasStock.getNum());
                if(count == 1){
                    skuStocked = true;
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo stockDetailTo= new StockDetailTo();
                    BeanUtils.copyProperties(entity,stockDetailTo);
                    lockedTo.setDetailTo(stockDetailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else{
                    //当前仓库锁失败，重试下一个仓库
                }

            }

            if(skuStocked == false){
                throw new RRException(skuId+"不存在");
            }
        }

        return true;
    }



    @Data
    class SkuWareHasStock{
        private Long skuId;
        private List<Long> wareId;
        private Integer num;
    }

}